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(N70 Model.)

J. G. HAAG & E. W.-EVANS.

TUNNEL FOR CABLE RAILWAYS. No. 355,448. Patented Jan. 4, 1887.

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7 UNITED STATES PATENT OFFICE.

JOHN-C. HAAG AND EDlVIN W. EVANS, OF NE\V YORK, N. Y.

TUNNEL FOR CABLE RAILWAY S.

SPECIFICATION forming part of Letters Patent No. $55,448, dated January 4, 1887. Application filed November 1886. Serial No. 217,934 (No model.)

To aZZ whom it may concern:

Be it known that we, JOHN C. HAAG and EDWIN V. EVANS, both of the city and county of New York, in the State of New York, have invented a newand useful Improvement in Tunnels for Cable Railways, of which the following is a specification.

Our invention relates to railways in which the cars are drawn or propelled by means of an endless cable or wire rope working in a tunnel arranged beneath the street-level be tween the track-rails, and in which the communication between the street-level and the tunnel is a narrow slot formed by two parallel slot-bars or bars of rolled iron secured at a proper distance apart and in fixed relation to each other. In such railways the trackrails and the slot-bars are supported by cast or wrought metal yokes or frames, which are arranged transversely to said rails and bars at a few feet apart. When the tunnel for the cable and its supporting-pulleys has been constructed of masonry or of concrete it has been necessary to leave the trench or tunnel excavation open for a long time, in order to allow the masonryor concreteasufficienttimetoset orbecome thoroughly dry, and the street has therefore been obstructed for an inconveniently long time. To avoid such continued obstruction of the street, it has been proposed to make the tunnel of planks or tiles of small size properly joined together, and also of previously-formed slabs of cgncrete of larger size than the tiles. The tunnel constructed of wood would of course not be desirable, because of the perishable nature of the wood, and the construction of tiles and previouslyformed slabs orsections of cement or concrete is expensive, because of the labor involved in making and laying the tiles and in making the slabs or sections of cement or concrete, and because of the cost of the material used in making such slabs or sections.

Our present invention consists in the combination, with the iron yokes or transverse frames for supporting the rails and slot-bars of a cable railway, of' a cable-tunnel constructed of pre'viouslymolded sections or slabs of blast-furnace slag. Blast-furnace slag is desirable as a material from which to form the tunnel slabs or sections for various reasons; It comprises iron as an ingredient in large proportion, slag often having as much as thirty per cent. of iron in its composition, and hence when molded or cast into slabs or sections and combined with the transverse yokesv or frames, we provide, in connection with the iron yokes or frames, a tunnel structure which is itself largely composed of iron,.

and which is therefore of great strength. Although attempts have been made to utilize blast-furnace slag for some purposes, no considerable quantity of it is used, and immense uantities of slag are produced every year as a waste product; hence the material itself is far less expensive than cement or clay suitable for forming tiles, and while in a molten state in the blast-furnace it may be run into suitably-constructed molds for receiving it, and thus without any material expense'be cast directly into slabs or sections of the proper size and shape to form atunnel.

In the accompanying drawings, Figure 1 is a transverse section of a cable railway having a tunnel constructed according to our invention, and Fig. 2 is a horizontal section upon about the plane of the dotted line 00 m, Fig. 1,

showing two of the transverse yokes or frames which support the rails and slotbars, and also showing the portion of the tunnel which is between such yokes or frames and the end portions or sections which are, on opposite sides thereof.

Similar letters of reference designate corresponding parts in both figures.

A A designate the track-rails of the railway, and B B the two slot-bars, which extend parallel with each other and form between them the slot b, through which the tunnel O tions of blast-furnace slag, which are previously cast in molds to give them proper size and shape. These slabs or sections may be of any desired size and shape, in order to form, when properly combined together, a tunnel, O, of suitable transverse section. In the present example of our invention the tunnel C is composed of slabs or sections 0, which are curved or of segmental shape in their transverse section, and are of sufficient length to extend between the frames or yokes D. The slabs or sections C each form one side of the tunnel, and are curved so that they converge to their lower edges, where they approach near to each other, and the space or opening between the lower edgcs'of the sections 0 cast slabs or sections of blast-furnace slag suitable for the purpose willbe less than the cost of producing such slabs or sections of edge.

any other material of which we have knowl- The tunnel constructed of such slabs or sections will be thoroughly water-proof and indestructible .when buried in the ground, and by the use of slabs or sections composedof slag we provide, in connection with the iron transverse yokes or frames D, a tunnel structure which is itself largely composed of iron, and hence adds to the strength and rigidity of the railway structure.

What we claim as our invention, and desire to secure by Letters Patent, is'

The combination, with the iron yokes or transverse frames for supporting the rails and slot-bars of a cable railway, of a cable-tunnel constructed of previously-molded sections or slabs of blast-furnace slag, whereby there is produced, in connection with the said iron yokes or frames, a tunnel structure which is itself largely composed of iron, substantially as herein described.

' JOHN G. HAAG.

EDWIN \V. EVANS.

itnesses:

FREDK. HAYNES, HENRY J. MCBRIDE. 

